Study on ensuring indoor fresh air volume in winter

Objective: This paper presents a method for improving and evaluating indoor air quality by open window which make sure quantity of fresh air.Study design: The air change rate was detected between November 2002 and March 2003. The efficiency data were 204. The Testing shapes of chamber were office.Method: The air change rate in this paper is basis on the date of measurement with air change rate, under different temperature differential and meteorological condition.Result: Keeping fresh air, office should open window at least 4 min (once every hour), if its space was from 30 m3 to 60 m3, in winter.Conclusion: Windows should be opened either in a discrete manner (once every hour), or in a continuous manner (let windows open slightly for a long period of time).